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Redeyestudio53
18.01.2021 •
Physics
The world’s largest gold bar, worth ten million dollars in 2014, has a base measuring 46 cm ×
22 cm and exerts a pressure of 24 000 Pa on the surface it sits on.
a) Calculate the weight of the bar. Write your answer to two significant figures.
b) Calculate the mass of the bar. Write your answer to two significant figures.
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Ответ:
a} 2400 N
b}240 kg
Explanation:
Pressure is force per unit area.
Given from the question that;
The pressure = 24000 Pa
Area = 0.46 * 0.22 =0.1012 m²
Calculating force from the formula;
P= F/A where P is pressure, F is force and A is area then
F= P*A = 24000*0.1012 = 2428.8 N
a) The weight is 2400 N in 2 significant figures
b) Mass is calculated from the formula;
w= m* g where w is weight, m is mass and g is acceleration due to gravity
2400 = m * 9.81
m= 2400/ 9.81
m= 244.64
m= 240 kg { in 2 significant figures}
Ответ:
tenth place is the number directly after the decimal